Assigning housekeeping sheets glitch

Assigning housekeeping sheets glitch

Hello, 

   My name is Meleiah. I am Front Office Manager here in IL. I was assigning rooms to my housekeepers as I always do, we had and extra housekeeper so i had to redo the list. Well i unassigned and refreshed and it would not allow me to make any changes to the list. Has this happened to others? I never got it to work that day. Any advise when this happens?